Assessing interactive responses in litter decomposition in mixed species litter
- 220 Downloads
The aim of this research is to propose an improved method to partition single species contributions to decomposition in mixed species litters and to detect additive or non-additive responses in litter decomposition. Using simulated data, we demonstrate that additive responses can arise from multiple conditions, including no changes in litter decomposition rates of both species in the mixtures, or an enhanced decomposition of one species and a reduced decomposition of another. Antagonistic responses can be caused by reduced decomposition of only one species, or of both species. Without partitioning of the contributions of single species proposed here, it is difficult to distinguish the different causes of the overall responses. Our analyses provide a better understanding of litter decomposition in mixtures and have significant implications for modeling litter decomposition.
KeywordsLitter decomposition Mixed species Non-additive effects
We thank Drs. Rebecca McCulley and Kirsten Hofmockel and anonymous reviewers for their constructive comments and suggestions that made this manuscript much improved. This work was supported by grants from NICCR-DOE and NIGEC-DOE (through the office of Biological and Environmental Research at the Department of Energy), the National Science Foundation, the Inter American Institute for Global Change Research, and the Andrew W. Mellon Foundation.
- Glantz SA, Slinker BK (2001) Primer of applied regression and analysis of variance, 2nd edn. McGraw-Hill, New YorkGoogle Scholar
- Hui D, Jiang C (1996) Practical statistical analysis system (SAS) usage. Beijing University of Aeronautics and Astronautics Press, Beijing, ChinaGoogle Scholar
- Nerlove M (2005) On the numerical accuracy of Mathematica 5.0 for doing linear and nonlinear regression. Math J 9:824–851Google Scholar
- SAS Institute Inc. (2008) SAS/STAT Ò 9.2 user’s guide. SAS Institute Inc, Cary, NCGoogle Scholar
- Schlesinger WH (1997) Biogeochemistry: an analysis of global change, 2nd edn. Academic, New YorkGoogle Scholar
- Swift MJ, Heal OW, Anderson JM (1979) Decomposition in terrestrial ecosystems. Studies in ecology, vol. 5. Blackwell, OxfordGoogle Scholar